<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleList">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight':totalCount > 0}">
              <span class="icon-shopping_cart" :class="{'highlight':totalCount > 0}"></span>
            </div>
            <div class="num" v-show="totalCount > 0">{{totalCount}}</div>
          </div>
            <div class="price" :class="{'highlight':totalPrice > 0}">¥{{totalPrice}}元</div>
            <div class="desc">另需配送费¥{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">{{payDesc}}</div>
        </div>
        <transition name="fold">
          <div class="shopcart-list" v-show="listshow">
            <div class="list-header">
              <h1 class="title">购物车</h1>
              <span class="empty" @click="empty">清空</span>
            </div>
            <div class="list-content" ref="listContent">
              <ul>
                <li class="food" v-for="(food, index) of selectFoods" :key="index">
                  <span class="name">{{food.name}}</span>
                  <div class="price">
                    <span>¥{{food.price*food.count}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cart-control :food="food"></cart-control>
                  </div>
                </li>
              </ul>
            </div>
          </div>
        </transition>
      </div>
    </div>
    <transition name="fade">
      <div class="list-mask" v-show="listshow" @click="hidelist"></div>
    </transition>
  </div>
</template>
<script>
import CartControl from '../cartcontrol/CartControl'
import BScroll from 'better-scroll'
export default {
  name: 'ShopCart',
  data () {
    return {
      fold: false
    }
  },
  props: {
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 0
    },
    selectFoods: {
      type: Array,
      default () {
        return []
      }
    }
  },
  computed: {
    totalPrice () {
      let total = 0
      this.selectFoods.forEach((food) => {
        total += food.price * food.count
      })
      return total
    },
    totalCount () {
      let count = 0
      this.selectFoods.forEach((food) => {
        count += food.count
      })
      return count
    },
    payDesc () {
      if (this.totalPrice === 0) {
        return `¥${this.minPrice}元起送`
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice
        return `还差¥${diff}元起送`
      } else {
        return '去结算'
      }
    },
    payClass () {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough'
      } else {
        return 'enough'
      }
    },
    listshow: {
      get: function () {
        return this.fold
      },
      set: function () {
        if (!this.totalCount) {
          this.fold = false
          return false
        }
        let show = this.fold
        if (show) {
          if (!this.scroll) {
            this.$nextTick(() => {
              this.scroll = new BScroll(this.$refs.listContent, {click: true})
            })
          } else {
            this.scroll.refresh()
          }
        }
        return show
      }
    }
  },
  methods: {
    toggleList () {
      if (!this.totalCount) {
        return
      }
      this.fold = !this.fold
    },
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0
      })
    },
    hidelist () {
      this.fold = false
    },
    pay () {
      if (this.totalPrice < this.minPrice) {
        return
      }
      window.alert(`支付${this.totalPrice}元`)
    }
  },
  components: {
    CartControl
  },
  watch: {
    totalCount: function () {
      if (!this.totalCount) {
        this.fold = false
        return false
      }
    },
    fold: function (totalCount) {
      let show = this.fold
      if (show) {
        this.$nextTick(() => {
          if (!this.scroll) {
            this.scroll = new BScroll(this.$refs.listContent, {
              click: true
            })
          } else {
            this.scroll.refresh()
          }
        })
      }
      return show
    }
  }
}
</script>
<style lang='stylus' scoped>
  .shopcart
    position: fixed
    left: 0
    bottom: 0
    z-index: 50
    width: 100%
    height: 48px
    background: #000
    .content
      display: flex
      background: #141d27
      font-size: 0
      .content-left
        flex: 1
        .logo-wrapper
          display: inline-block
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          vertical-align: top
          border-radius: 50%
          background: #141d27
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            text-align: center
            border-radius: 16px
            font-size: 9px
            font-weight: 700
            color: #ffffff
            background: rgb(240, 20, 20)
            box-shadow: 0 4px 8px 0 rbga(0, 0, 0, 0.4)
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            background: #2b343c
            &.highlight
              background: #0affe8ba
            .icon-shopping_cart
              font-size: 24px
              line-height: 44px
              text-align: center
              margin-left: 10px
              color: #80858a
              &.highlight
                color: #fff
        .price
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin-top: 12px
          padding-right : 12px
          box-sizing: border-box
          border-right: 1px solid #80858a
          font-size: 16px
          font-weight: 700
          color: rgba(255, 255, 255, 0.4)
          &.highlight
            color: #fff
        .desc
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin: 12px 0 0 12px
          color: rgba(255, 255, 255, 0.4)
          font-size: 10px
      .content-right
        flex: 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height: 48px
          text-align: center
          font-size: 12px
          font-weight: 700
          color: rgba(255, 255, 255, 0.4)
          background: #2b333b
          &.not-enough
            background: #2b333b
          &.enough
            background: #00b43c
            color: #ffffff
    .shopcart-list
      position: absolute
      top: 0
      left: 0
      z-index: -1
      width: 100%
      transform: translate3d(0, -100%, 0)
    .fold-enter-active, .fold-leave-active
      transition: all .5s
    .fold-enter, .fold-leave-to
      transform: translate3d(0, 0, 0)
    .fold-enter-to, .fold-leave
      transform: translate3d(0, -100%, 0)
    .list-header
      height: 40px
      line-height: 40px
      padding: 0 18px
      background: #f3f5f7
      border-bottom: 1px solid rgba(7, 17, 27, 0.1)
      .title
        float: left
        font-size: 14px
        color: rgb(7, 17, 27)
      .empty
        float: right
        font-size: 12px
        color: rgb(0, 160, 220)
    .list-content
      overflow: hidden
      padding: 0 18px
      max-height: 217px
      background: #ffffff
      .food
        position: relative
        padding: 12px 0
        box-sizing: border-box
        .name
          line-height: 24px
          font-size: 14px
          color: rgb(7, 17, 27)
        .price
          position: absolute
          right: 90px
          bottom: 12px
          line-height: 24px
          font-size: 14px
          color: red
          font-weight: 700
        .cartcontrol-wrapper
          position: absolute
          right: 0
          bottom: 6px
  .fade-enter-active, .fade-leave-active
    transition: all .5s
  .fade-enter, .fade-leave-to
    opacity: 0
    transform: rgba(7, 17, 27, 0)
  .list-mask
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: 40
    filter: blur(10px)
    background: rgba(7, 17, 27, 0.6)
</style>
